After Allah mentions that those who have Taqwa, will have Gardens of Delight with their Lord, He explains when this will be, and its actual occurrence. He says,

﴿يَوْمَ يُكْشَفُ عَن سَاقٍ وَيُدْعَوْنَ إِلَى السُّجُودِ فَلاَ يَسْتَطِيعُونَ ﴾

(The Day when the Shin shall be laid bare and they shall be called to prostrate themselves, but they shall not be able to do so.) meaning, the Day of Judgement and the horrors, earthquakes, trials, tests and great matters that will occur during it. Al-Bukhari recorded that Abu Sa`id Al-Khudri said that he heard the Prophet saying,

«يَكْشِفُ رَبُّنَا عَنْ سَاقِهِ، فَيَسْجُدُ لَهُ كُلُّ مُؤْمِنٍ وَمُؤْمِنَةٍ، وَيَبْقَى مَنْ كَانَ يَسْجُدُ فِي الدُّنْيَا رِيَاءً وَسُمْعَةً، فَيَذْهَبُ لِيَسْجُدَ، فَيَعُودُ ظَهْرُهُ طَبَقًا وَاحِدًا»

(Our Lord will reveal His Shin, and every believing male and female will prostrate to Him. The only people who will remain standing are those who prostrated in the worldly life only to be seen and heard (showing off). This type of person will try to prostrate at that time, but his back will made to be one stiff plate (the bone will not bend or flex).)'' This Hadith was recorded in the Two Sahihs and other books from different routes of transmission with various wordings. It is a long Hadith that is very popular. Concerning Allah's statement,

﴿خَـشِعَةً أَبْصَـرُهُمْ تَرْهَقُهُمْ ذِلَّةٌ﴾

(Their eyes will be cast down and ignominy will cover them;) means, in the final abode, due to their crimes and arrogance in the worldly life. Thus they will be punished with the opposite of what they did. When they were called to prostrate in the worldly life, they refused to do so even though they were healthy and secure. Therefore, they will be punished with the lack of ability to do so in the Hereafter. When the Almighty Lord makes Himself visible (before the believers), then the believers will fall down in prostration to Him, but no one of the disbelievers and hypocrites will be able to prostrate. rather, their backs will become one plate. Everytime one of them attempts to prostrate, he will bow his neck but will not be able to prostrate. This is just like in the life of this world, when these people were in opposition to what the believers were doing.